Tailstock



Dec. 13, 1927.

C. F. RANDOLPH TAILSTOCK Filed Feb. 18. 192s I 5 sheets-shea 1 INVENTOI? C3 MW A TTUH EY J n n..

mw @i 1,652,412 c. F. RANDAAOLPH TAILSTOCK Filed Feb. 18. 1926 5 Sheets-Sheet 2 De A113, 1927. 1 1,652,412

c. F. RANDOLPH .y

TAILSTOCK Filed Feb, 18. 192e s sheets-shed s INVENTUZ /W/w axial position. As this construction is similar to those usually employed, it is not thought that further description is necessary. Ontlie rear vertical face of the tailstock body member 'l0 is secured a small bracket E22 on which is mounted an electric motor 23, the armature shaft Q-t of which is connected to a driving shaft mounted within the body member i and having a small pinion 26 near its opposite end. In mesh with this pinion is an idler gear 27 rotatably mounted on a stud QS fixed within the body member 10. This gear 27 meshes with a driving gear 29 on a `shaft $30 extending axially and centrally of the tailstock 10. This shaft 30 is most clearly shown in Fig. 3 and is provided with a clutch member 31 splined thereto and having clutch teeth on its opposite faces. Adjacent `one side of this clutch member 3l is a pinion 3Q rotatably mounted on the shaft and provided with clutch teeth` on one face. This pinion is in engagement with a gear on a `rotatable sleeve 34C. It will be seen from this construction that by movingr the clutch member 31 into engagement` with the teeth rovided on the face of the pinion 3Q, that tie sleeve 34 may be rotated, the direction of rotation depending upon the direction of rotation of the electric motor Q3.

The sleeve 34e on which this driving gear `33 ismounted is rotatable within suitable `that rotation of the sleeve 34 will force the bars; 3G toward or fromcach other. On these bars or rods 36 are fastened wedges `Si', shown clearlyin Fig. 4;. `Prefcn'ably and as shown, the lower surfaces of these wedges 3T extend parallelly with the direction of movement of the rods and are engaged by rollers BSsuitably mounted within the member to reduce friction. The upper surfaces of these wedges 37 are disposed obliquely and in opposed relationship to each other, as shown clearly in Fig. 4, These wedge surfaces are engaged by rollers 39 mounted on clamping levers 40, oscillatoryT movement of which effects clamping and un clamping operations of the tailstock l0.

Pressing against the outer faces of the wedges El( are springs 41 `normally forcing the wedges 37 toward each other. and the sleeve Btaxially through the gear 33 so thatthe wedges 3T will force the clamping levers 4;() `upwardly with equal pressures against the, rollers 39. As shown clearly in Figs. 3 and 4., the hearings for the sleeve 34: and also for the lower rollers 38 are in the separate member 35 securely fastened by means of screws 4Q to the lower surface of the body member 10.

ln order that the clamping levers 40 may clamp the tailstock 10 securely to the ways 1l, transversely extending clamping strips ilo are mounted below the tailstock .l0 and formed to engage the under side of the ways il of the lathe hed.` These strips 4J) are supported in position upon the tailstock l() hv means of bolts 4G, two bolts being used for each of the strips 475. Nuts 47 on the bolts 4G provide means for `varying the effective length thereof and a wtsher 48 be-` low the musa-'7 is preferably provided on each bolt 46 for engagement with the clamp ing levers 4:0. its lower surface being spherical. Just below this wasliler 48 is positioned the clamping levers t0 above described.l having depressions formed therein `for the spherical surfaces of the washers 48 and hav ing their outer lower extremities 49 adapti ed to rest upon and be fulcrumed relative to the tailstock l0. By means of the right* and left-hand screws on the rodst,` the wedges 3T may be moved toward or from each other and. whilemoving toward each other, will raise the inner ends of the clamping levers 40, thus raising the bolts .46 slight-` ly and clamping the strips 45 rigidly to the ways l1 of the lathe. By reason `ofthe sleeve 234. being splined to the driving gear 33 the rods 3G, the wedges 37 and the sleeve 3a can move axially. This permits the springs 41 to force the wedges to positions to equalize the clamping effect of` the levers 40.

On the opposite side of the clutch 'member 31 on the driven shaft 3() isa sleeve 50 carrying a bevel pinion 5l at oneend which is engaged by a correspoiuling bevel gear 52 on a 'forwardly extending shaft 53. Clutch teeth are provided on this sleeve `50 for engagement with those on a face of the clutch member 3l. BV movement of the clutch member 3l toward the righhas "viewed in Fig. 3, rotation of the motor 23 in either direction will correspondiugly` rotate the bevel pinion 51 and the forwardly extend ing shaft Ou the forward end ofthis latter shaft 53 is a bevel pinion 54 in mesh with a bevel gear 55cm a sleeve 56 carrying a spur gear 57. Preferably this spur gear 57 and bevel gear 55 are mounted upon a Hxed stud 58 in a braclmtl 59 outstanding from thetailstock l0. Below this pinion 57` and stud 58 is a rotatablenut G0 held in position relative to the tailstoek bracket 59 by adjustable washers (il at one end and a fiange (S2 at its opposite end. This flange G2, as shown in Fig. l. forms aspur gear 61% which is in mesh with the spur pinion 54. Rotation therefore. of this forwardly extending shaft 53 in either direction will rotate this nut (l0 and thus traverse the tailstock 10 along the lathe ways 11 in either lio directionwby the engagement of the rotating nut 60 with a fixed screw .Gilextending along one of the ways 1l. ,v v

To move the clutch member 31 to either of its operative positions a lever 65 is providedy lfulcrumed at 66 and'having a member 67 engaging acircumferential groove Vin the clutch member 3l. This lever -.extends upwardly to form a handle so that the clutch a body member, an axially movable Spindle therein, means for clampingsaid tailstock to ways on which it is movable including oppositely movable wedges, screw threaded means for effecting simultaneous movement of said' wedges,r driving Vmeans for said rotary v means, a rrotatable nut on'said body member adapted to engage a fixed screw for travfy ersing the tailstock, driving connections therefor, an electric,motor'mounted. on said Y body member, and means to operate said rotary means for mov'ingsaridV wedges and to rotate said nut by said motor.v

2. A tailstock comprising incombination,

V`a body member, an axially 'movable spindle therein, means for clamping said tailstock to ways on which 1t V1s movable including oppositely movable wedges, screw threaded means vfor effecting movement of said wedges into and out ofclamping position', means permitting adjustment of said wedges to equalize the clamping action thereof,

y driving means for said screwfthreaded `means, a rotatablesnut on said body mempoint ofY Vber adapted to engage a fixed screw for traversing the tailstock, driving connections therefor, an electric motor mounted on said body member,rand means to operate said 'roltary means for moving said wedges and to Arota-te said nut by said motor.

3. A tailstock comprising in combination,

abody member, an' axially movable spindle therein, means for clamping saidtailstock to ways on which 1t is movable including oppositely movable wedges` rotary means for effecting movement of said wedges into and out of clamping positiom driving means for said rotary means, a Arotatable nut on said body member adapted toA engage a fixed screw for traversing tlie tailstock, driving connections therefor, an electric motor mounted on said body member, and optionallyk usable connections iii said body member for'operating said rotary means for saidA wedges and to rotate said nut by said motor, whereby said tailstock may be clamped v or traversed.

4. A tailstock comprising in combination, a body member, an axially movable spindle therein, means for clamping said tailstock to ways on which it is movable including oppositely vmovable wedges, screw threaded means for effecting simultaneous movement of said wedges,` rotating means 'for said i screw threaded means, a rotatable nut on said body Ymember adapted to engage a xed screw for traversing the tailstock,

driving connections therefor, an electricl motor mounted on lcentral shaft driven thereby, and a positive Vclutch on said g central shaft optionally Vusable to operatevsaid Vrotary means and to `rotate said nut.

said body member, a

In testimony whereof, I hereto affix my J signature.

CLIFFORD r. RANDOLPH. 

